I've never ran across Amano's locally to try.
However, I do have Cherries, Rudolfs, Ghost, Bamboo, Tiger, Indian prawns, as well as a couple I'm not sure of the identity. I've never dossed iodine, only epson salt, for the plants.
The only shrimp I feed from the list above is the Indian prawn, using shrimp pellets and uneaten food. Otherwise it gets a little aggressive and starts fishing for him /herself so to speak
This however is a 4" prawn. Shrimp on the barby size.
Seeing how I have never kept Amanos I'm going to go out on a limb. They seam to be algae eaters/scavengers.
IMO I would'nt supplement thier diet any. Just let them eat the algae and scavenge uneaten food.
Unless of course you have that stunning tank of yours running algae free, then you might want to supplement food
. Otherwise, forget about 'em. They'll take care of themselves.
FYI.......When you go to do
WC's or trim plants, make sure you don't toss a tiny shrimp out on accedent. It happens